HD64F7050 RENESAS [Renesas Technology Corp], HD64F7050 Datasheet - Page 85
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HD64F7050
Manufacturer Part Number
HD64F7050
Description
32-Bit RISC Microcomputer SuperH RISC engine Family/
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD64F7050.pdf
(841 pages)
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5.2
5.2.1
When the RES pin is driven low, the LSI does a power-on reset. To reliably reset the LSI, the RES
pin should be kept at low for at least the duration of the oscillation settling time when applying
power or when in standby mode (when the clock circuit is halted) or at least 20 t
clock circuit is running). During power-on reset, CPU internal status and all registers of on-chip
peripheral modules are initialized. See Appendix B, Pin Status, for the status of individual pins
during the power-on reset status.
In the power-on reset status, power-on reset exception processing starts when the RES pin is first
driven low for a set period of time and then returned to high. The CPU will then operate as
follows:
1. The initial value (execution start address) of the program counter (PC) is fetched from the
2. The initial value of the stack pointer (SP) is fetched from the exception processing vector table.
3. The vector base register (VBR) is cleared to H'00000000 and the interrupt mask bits (I3–I0) of
4. The values fetched from the exception processing vector table are set in the program counter
Be certain to always perform power-on reset processing when turning the system power on.
exception processing vector table.
the status register (SR) are set to H'F (1111).
(PC) and SP and the program begins executing.
Resets
Power-On Reset
Rev. 5.00 Jan 06, 2006 page 65 of 818
Section 5 Exception Processing
REJ09B0273-0500
cyc
(when the
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